How to mix gasoline with chainsaw oil

How to mix your own fuel for STIHL chainsaws & equipment

How to dilute gasoline with chainsaw oil

The surest solution is to follow the recommendations specified in the instructions for the product! In the absence of such an opportunity, you can use a special fuel preparation formula.


According to the international classification, oils of the following markings are used for chainsaws:

  • API-TB;
  • API-TS;
  • JASO-FB;
  • JASO-FD.
  • Use oil for 2-stroke engines only;
  • Do not use the material after the expiration date;
  • It is strictly forbidden to add working off (it contains many unnecessary impurities. harmful to the central mechanism of the chainsaw);
  • You can not use chain lubricant (for each device: chain and engine. it is its own);
  • It is preferable to use synthetics or semi-synthetics (during development, it almost does not form combustion products, but the price of such material is higher than that of mineral oils).


There are several options for the ratio of fuel and lubricant. As a rule, this number ranges from 20 to 50 ml of oil per 1 liter of gasoline.

Again, you must follow the instructions for the product or the recommendations indicated on the oil label (priority of the instruction). In the absence of such, before diluting gasoline, you need to pay attention to the power indicator of the product, since the created proportion directly depends on it.

  • Up to 1.5 kW, the recommended ratio is 25 ml of oil per 1 liter of gasoline;
  • Above 1.5 kW 20ml / L.

In gasoline for a chainsaw, it is allowed to add oil a little more than the recommended proportions (up to 5 ml per 1 liter). In this case, you should be extremely careful, because non-observance of the proportions can lead to breakdown, and as a result, expensive repairs.

If you dilute gasoline with a large volume of oil, then during operation the number of shock loads on the cylinder-piston system will be increased, and carbon deposits may also form, as a result of which the CHP will fail.

The addition of a small amount of oil to gasoline for a chainsaw can lead to insufficient lubrication of the surfaces of moving elements, which will lead to additional friction of the elements and their heating, followed by the destruction of the entire mechanism.


Not only the quality and proportion of fuels and lubricants is important (although it is dominant in this matter), but where and how (how) gasoline is diluted with oil for chainsaws.

The technology provides for the use of containers with graduated divisions, some brands (along with chainsaws and oil) produce containers for mixing and storing fuel. Made of a special non-combustible material, they are produced in the form of a canister or bottle, often endowed with measuring lines, and some of them have two entrances (separate for each type of fuel and lubricants).

gasoline, chainsaw

Often, improvised means are used for mixing:

  • Plastic / glass bottles;
  • Syringe (no needle);
  • Measuring cups;

When using household products, be extremely careful, because during the mixing process, when combustible material interacts with the surface of non-specialized containers, static electricity can be generated. this is fraught with an explosion. When making a mixture, oil is added to gasoline, since it has a higher density.

Fuel quality

If you want the tool to do its job perfectly and last for more than one year, you must provide it with fuel and lubricant of the proper quality.


According to experts, it is necessary to use unleaded fuel with an octane rating exceeding 90. Gasoline A92 and Ai92 is considered ideal. You can use the 95th, but there is an opinion that it is better to refrain from this kind of gasoline, since some of them are made on the basis of the 92nd with the addition of additives. The latter, in turn, are harmless for 4-stroke car engines, but they will be superfluous for the “sensitive” mechanisms of 2-stroke motors.

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It is recommended to use fresh gasoline for chainsaws, since when stored in cans the fuel can lose its octane properties.

gasoline, chainsaw

Mixing principle and proportions

Oil from all manufacturers, except for Husqvarna, must be diluted at a ratio of 1:33, that is, the output will be a 3% mixture with the following composition: 30 grams of oil is required per liter of gasoline.

Husqvarna oil is mixed at a ratio of 1:50, the output is a mixture of 2%, which contains 20 grams of oil per liter of gasoline.

The volume of the chainsaw tank differs based on the engine power and its capacity (in cc). The average capacity of gasoline tanks for chainsaws is from 300 to 600 ml and more, oil tanks. from 200 to 400 ml. and more. The more horsepower the saw gives out, the more gasoline is placed in the gas tank.

The average fuel consumption per hour for a chainsaw is from 257 to 380 g / kW / h. The consumption of the gasoline-oil mixture depends on such indicators as the degree of load on the chainsaw, operating time without shutdown, the condition of the saw chain and tire, the coordination of the carburetor, as well as the model of the chainsaw.

For example, the latest generation of saws consume fuel more economically than older models.

Proportions of oil and gasoline for a chainsaw. preparing a mixture for refueling a two-stroke engine

Fuel mixture preparation rules

The process of preparing the fuel mixture should begin with a detailed acquaintance with the instructions attached to it. As mentioned at the beginning of the article, some drivers who, in their opinion, have incredible experience, do everything “by eye”. Of course, over time, each driver knows how and what needs to be done, however, each mixture has its own differences, so it will never be superfluous to get acquainted with the advice from the manufacturer.

The main rules for operating the fuel mixture include:

  • Do not under any circumstances reduce the proportion of oil in relation to gasoline. Oil is an expensive component, so many people decide to save on it. However, an insufficient amount of oil in the mixture leads to strong heating of the piston and cylinder of the engine. Because of this, seizures appear, which ultimately leads to the need for serious repairs.
  • Do not use too much oil in relation to gasoline. Increasing the proportions of the oil is also detrimental to engine performance. An excessive amount of oil leads to an increase in carbon deposits and rapid wear of the engine mechanism. Repair in this case will be as expensive as in the first case.
  • Do not store the prepared mixture for more than 30 days. Otherwise, it loses its properties and the use of such a mixture can harm the engine.
  • Do not allow dirt, dust and other mechanical debris to enter, due to which the engine may become unusable.

Oil ratio for gasoline mixture preparation

Fuel saturated with lubrication leads to the appearance of soot on the cylinders and piston scratching; gasoline ignites worse, which is why the engine efficiency decreases. If the oil is not added, the piston rings will collapse, the engine will jam due to excessive friction.

When it is not clear how to mix, if one is written on the tank, another is written in the manual, and the third proportion is on the canister, you need to follow the one indicated on the oil bottle. Unambiguously.

Step-by-step instructions for refueling

If you want to refuel your chainsaw, you need to follow a simple algorithm:

Chainsaw refueling instructions

Knowing the ratio of the preparation of the petrol-oil mixture, you can start refueling it. Refueling instructions are as follows:

  • First you need to prepare the mixture. Having combined the two main components, you should mix them thoroughly.
  • Place the tool on a clean and level surface. Before unscrewing the gas tank cap, it is necessary to clean or blow off sawdust, dust and dirt.
  • The filler neck must point upwards.
  • Install a small watering can in the neck, then pour fuel
  • Control the refueling process, as the volume of the tank is small, so it fills up quickly
  • Do not fill up to the full maximum, since when the tank cap is closed, the remaining fuel will splash out.
  • After the fuel is poured into the tank, immediately add chain lubricant.
  • Fuel consumption and chain lubrication are approximately the same, therefore both tanks must be filled at the same time.
  • After refueling, you can start starting the engine.
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It is better to start the engine not in the place where the refueling was carried out, but to move to a distance of 2-3 m. The tool is ready for work, and you can start to start it. How the chainsaw engine starts, you can read in this material (link).

Why you need to mix oil and gasoline

When using the saw, gasoline should always be mixed with oil. The reason for this is the design features of a two-stroke internal combustion engine. It does not have a dedicated lubrication system for parts (as in other internal combustion engines) and, accordingly, its cylinders with O-rings, crankshaft, bearings and connecting rods must be lubricated directly in the process of obtaining fuel.

Device aspects

Before considering the above issues, it is necessary to understand the design features of the chainsaw in order to have at least a general idea of ​​its structure. At its core, this tool belongs to the classic mechanisms that work through the use of an internal combustion engine.

This type of tool is considered the simplest among all such mechanisms, since the chainsaw does not have a gearbox, and it is driven by a simple two-stroke single-cylinder gasoline engine.

The main advantage of the chainsaw is its simple design, which ensures high reliability and trouble-free operation even in difficult conditions. The design of the chainsaw includes the following elements:

  • motor;
  • fuel system;
  • clutch;
  • air purification system;
  • ignition system;
  • starter;
  • chain brake;
  • carburetor;
  • chain;
  • chain tensioning mechanism;
  • tire;
  • chain lubrication system.

Timely and correct lubrication of the parts of the gasoline saw is of great importance. Like all machines, the entire chain saw and its individual parts need regular maintenance, including periodic lubrication.

This is necessary to extend the life of the tool. During the operation of a gasoline saw, its parts are in constant motion. It should be smooth and fluid so as not to harm nearby parts.

Everyone knows that the surface is destroyed by friction, therefore, in the absence of lubrication, the elements of the chainsaw will wear out very quickly, which will lead to its failure. To avoid this, you should provide the necessary maintenance of the chainsaw in a timely manner. In this case, it will serve you for a long time.

Gasoline and oil. Two-stroke and four-stroke scooters. Operation, maintenance and repair. Company MOTO-VELO, Kolomna, Moscow region, buy, motorcycle parts, motorcycle, bicycle, spare parts, motorcycle, motorcycle parts, bicycle parts, sports, chainsaws, motoblocks, snowmobiles. Motorcycle Club Norton

Two-stroke and four-stroke scooters. Operation, maintenance and repair. Gasoline and oil

Characteristics of household chainsaws

The chain speed depends on the speed of the air-cooled engine. A separate oil tank is provided for lubrication and cooling. With an increase in the frequency of its rotation, the automatic supply of oil also increases. For normal operation of the chainsaw, it is necessary to control the contents of two tanks. for the engine and the chain to work.

In what proportions to mix liquids?

Each chainsaw manufacturer determines its proportions to obtain a gasoline-oil mixture and indicates this in the technical passport that is attached to the tool upon purchase. The proportions of gasoline and oil for chainsaws of domestic production are most often recommended in a ratio of 1:15 or 1:20. In order to calculate how much oil is required per liter of gasoline, you need 1000/15 = 65 ml and 1000/20 = 50 ml. In the first case, 65 ml of oil are added to each liter of gasoline, and in the second. 50 ml of oil. For imported equipment, the proportions are somewhat different.

For a Husgvarna chainsaw with an engine power of 2 kW, the manufacturer advises using a ratio of 1:50, that is, add 20 ml of oil for every liter of gasoline. Chinese-made saws require 40 ml of oil per liter of gasoline at a ratio of 1:25. It should be remembered that with an excess of oil in gasoline, carbon deposits increase, the cylinder becomes clogged, piston rings are damaged and compression decreases. If there is a lack of oil, the engine overheats and the performance of the tool sharply decreases. When the documentation is lost and you do not know how to mix gasoline with chainsaw oil, you can contact the service center for the necessary information.

Gasoline to chainsaw oil ratio

The proportions of oil and gasoline for refueling two-stroke engines of chainsaws of different brands is 40 to 1 or 50 to 1. This ratio is standard, which is used not only by beginners, but also by experienced sawers. It is this ratio for preparing the fuel mixture that is close to ideal, and provides lubrication of the rubbing parts of the crank mechanism and the piston.

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How much oil should be poured into gasoline in milliliters? Calculated per ml, the proportion of oil and gasoline 1 to 50 is 20 ml per 1 liter. To prepare the correct mixture, you should fill 1 liter of gasoline in a plastic bottle and dilute it with 20 ml of oil. To correctly measure how much oil to pour, you should take a special measuring container and fill it up to the appropriate mark. If you plan to immediately prepare 2 liters of fuel, then 40 ml of lubricant must be added to this amount of gasoline.

There are other ratios that different manufacturers offer. These values ​​of the ratios differ insignificantly, but if you have subtracted other values ​​in the instrument’s passport, then you need to adhere to them. A value of 1 in 50 or 40 is standardized. Pour 15 ml of oil into 1 liter of fuel in the summer, and in winter, add at least 20-25 ml. Knowing the recipe for preparing the mixture, you should also figure out what kind of gasoline to pour into the chainsaw?

How to dilute gasoline with chainsaw oil: types of oils, choice of gasoline, proportions and mixing procedure

  • March 22, 2019
  • miscellanea
  • Svetlana Pavlova

A variety of brands of chainsaws are purchased by owners of country houses. The miracle technique is indispensable for the preparation of firewood and the construction of outbuildings. Those who have been using this tool for a long time know all the intricacies of its maintenance. But for beginners, you should definitely learn how to dilute gasoline with chainsaw oil. This will be discussed in the article.

Caution. counterfeit!

Small private companies from China and other Asian countries specialize in the production of motor oils, which are sold at a lower cost in the markets under the trademarks of leading manufacturers.

  • The characteristics of counterfeit products are an order of magnitude lower than those of the branded originals. The constant use of counterfeit products adversely affects the operation of the chainsaw and the durability of its operation.
  • Only an experienced specialist can determine the status and quality of oil, therefore, you can avoid possible risks by buying consumable components in a network of branded and licensed retail outlets.
  • The use of substandard lubricants for service specialists is a legal basis for depriving the owner of a faulty saw of warranty repair and restoration obligations.

Chainsaw Basics: Fuel and Oil

Working proportions of the fuel mixture

The standard gasoline to oil mixture ratio for carburetor chainsaw engines of various models is 40: 1 and 50: 1. This proportion provides full lubrication of the rubbing parts of the crank mechanism and piston group, and also does not prevent the complete combustion of the gasoline-air mixture.

Taking into account external factors, the fuel mixture can be adjusted in the direction of increasing the amount of oil. Such a need arises at the stage of running in a new tool, as well as at high air temperatures. In this case, the standard oil dosage is increased by 20%.

In practice, an increase in the percentage of oil in the fuel mixture is used if its characteristics do not fully meet the stated requirements. How much oil per liter of gasoline is needed in each case is determined by the sawman himself.

Features of preparation and storage of the fuel mixture

Safety regulations prescribe to dilute gasoline and oil in a metal canister. This eliminates the risk of static electricity and fuel ignition.

Experts advise to pour oil into an incomplete container, mix thoroughly, and then top up with clean gasoline to the specified level. Saving working time by preparing the working mixture directly in the gas tank of the chainsaw should be excluded from everyday practice.

This technology is fraught with fuel system failures due to the ingress of a large amount of oil into the carburetor, the need for disassembly and thorough flushing.